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Regional Basic Professional Training Course in Korea

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❙ 513 ❙<br />

8-B. Determ<strong>in</strong>istic Accident Analysis (LOCA)<br />

amount that would be generated if all of the metal <strong>in</strong> the cladd<strong>in</strong>g cyl<strong>in</strong>ders surround<strong>in</strong>g<br />

the fuel were to react (4) Calculated changes <strong>in</strong> core geometry shall be such that the core<br />

rema<strong>in</strong>s amenable to cool<strong>in</strong>g (5) After any calculated successful <strong>in</strong>itial operation of the<br />

ECCS, the calculated core temperature shall be ma<strong>in</strong>ta<strong>in</strong>ed at an acceptably low value<br />

and decay heat shall be removed for the extended period of time required by the long‐<br />

lived radioactivity rema<strong>in</strong><strong>in</strong>g <strong>in</strong> the core. It <strong>in</strong>cludes the ECCS evaluation model and<br />

licensee’s report<strong>in</strong>g for any changes or error <strong>in</strong> an acceptable evaluation model. ECCS<br />

cool<strong>in</strong>g performance shall be calculated <strong>in</strong> accordance with one of the acceptable<br />

evaluation models (conservative or best‐estimate models) and shall be calculated for a<br />

number of postulated loss‐of‐coolant accidents of different sizes, locations, and other<br />

properties sufficient to provide assurance that the most severe postulated loss‐of‐coolant<br />

accidents are calculated.<br />

ECCS cool<strong>in</strong>g performance shall be calculated <strong>in</strong> accordance with one of the follow<strong>in</strong>g<br />

acceptable evaluation models and shall be calculated for a number of postulated loss‐of‐<br />

coolant accidents of different sizes, locations, and other properties sufficient to provide<br />

assurance that the most severe postulated loss‐of‐coolant accidents are calculated.<br />

(1) Conservative model<br />

The conservative model must provide the model and calculation method whose<br />

conservatism is justified and approved for use. A conservative ECCS evaluation model<br />

may be developed <strong>in</strong> conformance with the required and acceptable features of KINS<br />

Technical Guidance, KINS/GT‐N007‐1, correspond<strong>in</strong>g to 10 CFR Part 50 Appendix K<br />

ECCS Evaluation Models [5].<br />

(2) Best estimate model<br />

The best estimate model <strong>in</strong> conformance with the required and acceptable features of<br />

KINS Technical Guidance, KINS/GT‐N007‐2 [6], correspond<strong>in</strong>g to US Regulatory Guide

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